Service manual

16
2. Trouble in Power on
No
No
Yes
Yes
Is 5VS line
normal?
Trouble in U3 & Q1
and its ambient circuit.
Trouble in SQ1 and
its ambient circuit.
Check on U1(scalier)
Is Power LED
on or off?
Off
No
Yes
On
Check the output
voltage
of adapter.
Refer to No video
or No raster.
Trouble
in the adapter.
Is the pulse
of pin 7
of -com.